TV best bets: Thur., May 22

8 p.m., CW/CHANNEL 11: Labyrinth — The lives of two young women eight centuries apart become intertwined in this four-hour adaptation of Kate Mosse's novel. In 1209 France, 17-year-old Alais (Jessica Brown Findlay) is given a book that may contain the secret of the Holy Grail. In the present, a volunteer (Vanessa Kirby) on an archaeological dig finds a tomb with two skeletons and mysterious carvings and begins to search for answers — which were never meant to be found.

9 p.m., FOX: Gang Related — Ramon Rodriguez ("The Wire") stars in this new crime drama as a member of an elite Los Angeles police task force dedicated to fighting the city's most dangerous gangs. What his colleagues don't know is that he still has ties to one of those gangs. Cliff Curtis and Terry O'Quinn also star.

9 p.m., TRAVEL CHANNEL: Greatest Mysteries: Louvre — History explorer Don Wildman expands on the "Mysteries at the Museum" theme for this new special, which takes him to Paris for a closer look inside the world's most visited museum. He shares the stories of an art lover's effort to save French culture, an ambitious matriarch who used paintings as propaganda and a sculpted head that played a key role in a supernatural good-versus-evil tale.

10:01 p.m., A&E: The Killer Speaks — In 1994, a drifter went on a killing spree that claimed six men's lives, covered three states — Florida, Georgia and Maryland — and earned him the nickname "the I-95 Killer." In October of that year, Gary Ray Bowles was arrested and confessed to all six killings. Now awaiting execution, he reveals the motives behind his crimes in the new episode "Gary Ray Bowles: The I-95 Killer."